Static and impact toughness properties of LB-PBF-built and heat treated 33CrMoV12 steel
Bibliographic record
Abstract
The mechanical properties of LB-PBF-build 33CrMoV12 steel grade were investigated for different material states (Asbuilt, tempered, double tempered and quenched-tempered) and discussed in relation to the inherited microstructures. As-built LB-PBF samples have higher tensile properties and lower impact toughness compared to the wrought material. A cellular microstructure was observed, consisting of martensite cells surrounded by nano-sized austenite. The presence of 25% of austenite is explained by a strong carbon segregation evidenced by high resolution SIMS (Secondary Ion Mass Spectroscopy). Further tempering causes an important drop in impact toughness. XRD showed that austenite was destabilized, forming brittle phases. Double tempering doesn't restore the impact toughness to the value of conventional material. Finally, austenite quenching and tempering allows to restore static and impact toughness similar to the value of conventional material, indicating a sufficient homogenization of the carbon microsegregations induced by fast solidification during LB-PBF process .
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.004 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".